1. Industrial Filtration and Water Treatment (Chem. Eng.) Group, Department of Process Engineering, ENSAI, University of Ngaoundere, Yaounde, Cameroon
2. Environmental Materials Division, CSIR-National Environmental Engineering Research Institute, Nehru Marg, Nagpur 440040, India
3. Wastewater Technology Division, CSIR-National Environmental Engineering Research Institute, Nagpur 440020, India
4. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India